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Counties → Ohio

Ottawa County, Ohio

SDWIS compliance plate

Sheet OH123 · Ottawa County 37 sys · 2,556 viol · #1059/3254

VIOL-SEVERE · HEALTH-MID · RANK-UPPER · PHOTO-FINISH · PFAS-MID · SRC-GW · SYS-SMALL · BOOK-FULL

  • VIOL-SEVERE 97.3% flagged
  • HEALTH-MID 30.4% health
  • RANK-UPPER #1059/3254
  • PHOTO-FINISH ±0.6 pp
  • PFAS-MID 33.3% detect
  • SRC-GW GW lead 76%
  • SYS-SMALL 37 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Clark County ( -0.6 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Ottawa County ranks #1,059 of 3,254 counties by people served, and #49 of 88 counties in Ohio. See methodology · corpus placement.

Ottawa County standing, mid-flagged corpus third

Flagged-system rate 97.3% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 30.4% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 33.3% is UCMR5 detect rate in the tested-pool middle third (≤ 33.3%) . Population served ranks #1,059 of 3,254 · #49 of 88 in Ohio.

Flagged-rate neighbourhood around Ottawa County

Lowest/highest poles plus in-state counties nearest Ottawa County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.

0% 20% 40% 60% 80% 100% Fayette · lowest Licking · near Preble · near Vinton · highest 78.6% 96.4% 96.6% 96.7% 96.7% 97.3% 100%

Source: EPA SDWIS (county aggregates) As of 2026-05-15

Water Systems

System Name Population Violations PFAS
Ottawa County Regional Water District 20,428 10 Detected
Port Clinton City 6,056 17 Clean
Oak Harbor Village 4,615 22 Clean
Genoa Village 3,110 79 -
Carroll Water and Sewer 2,288 31 -
Elmore Village 1,421 35 -
Marblehead Village 865 48 -
Put-IN-Bay Village 700 253 -
Cedarlane RV Park 600 23 -
Lake Erie Utilities Company 400 309 -
St Hazards - Middle Bass Island 300 34 -
J F Walleye 207 77 -
Blackberry Corners 150 33 -
Chippewa Golf Club 150 47 -
The Keg 115 51 -
Catawba Shores M H Court 102 37 -
Bethel United Brethren Church - Elmore 100 33 -
St John Lutheran Church Rocky Ridge 100 25 -
Crazy Lady Saloon 100 102 -
St Peters Lutheran Church/Preschool 89 115 -
Green Valley Mobile Home Park 82 141 -
Sugar Creek Golf Club 78 24 -
Greenwood Mobile Home Park 77 475 -
Grace Lutheran Church Elmore 75 51 -
Shade Acres Campground and RV Park 75 107 -
Ernestos Restaurant 71 35 -
North Point Education Service Ctr Ottawa 60 11 -
Graymont Dolime (OH) 60 50 -
Kaisers Limestone Tavern 54 92 -
The Mockingbird on Mill Road 53 0 -
Hidden Hideaway Campground West 50 20 -
Bench, Robert Amlc PWS 42 36 -
Elliston Zion UMC- Graytown 40 20 -
Hidden Hideaway Campground East 35 15 -
Rothert Amlc 30 24 -
Tri Motor Sales 27 70 -
Bench-Dickinson Amlc PWS 25 4 -

Compare beyond Ohio

Mid-flagged peers for Ottawa County

Cross-state counties nearest Ottawa County on flagged-system share (97.3%) and cumulative violation count (2,556). In-state neighbours stay on the compliance plate above.

Similar flagged-system rate

Nearest cross-state counties by % of SDWIS systems with at least one violation on record.

4 peers

Similar violation load

Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).

4 peers

Read our methodology · Check your water system - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.